Structure of an improved chair

ABSTRACT

A structure of an improved chair, comprising: one chair, one set of edge-bars of the chair-back, one set of edge-bars of the chair-seat and two metal-plates; the chair composed of tube or prism as the principal holder has a configuration having a chair-seat section and a chair-back section, wherein the present invention use edge-bars each having an extended part and a principal part, the edge-bar is die-cast, there is a U-shape fixing slit between the extended part and the principal part, and the extended has several holes, and after the fit-rim of the metal-plate is fitted into the U-shape fixing slit, the edge-bars and the metal-plate can be welded or riveted at the several holes of the extended part into a unified connector, which is unable to be dismantled, and thus provides a structure of a chair which two metal-plates can be fast fixed on the chair-seat and the chair-back.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a structure of an improved chair,particularly to a structure of an improved chair by bending inward theasymmetric edge of the metal-plate to form a fit-rim and then fit thefit-rim into the U-shape fixing slit of the edge-bar having an extendedpart.

2. Description of the Prior Art

People always pursuit better quality of life no matter how the historyevolves. Referring to the chair for supporting human body, providingwork on seat and resting, the types of chairs are fixed, rotatable,foldable, assembly-enabled, suspended, pneumatic chairs, and so theforms of chairs are chairs with back, chairs with arm-rest, bowleggedchairs, and chairs with curule legs. Still, there are many other ways ofclassification such as usage, material, and manufacture technology.

The conventional chair 5 with the metal-net frame, as shown in FIG. 7(A)and FIG. 8(A), wherein a metal-net frame 51 is formed by processing ametal material using a stamping die on a press. And the metal-net frame51 is welded on the chair 5 using the high-frequency oscillation energyof ultrasonic, as shown in FIG. 7(B). Alternatively, the metal-net frame51 is fixed on the chair 5 by bending inward the asymmetric edge 52 ofthe metal-net 51 and then fixing asymmetric edge 52 on the chair 5 bywelding on the inside of the chair 5 frame with welding material 53, asshown in FIG. 8(B). But such a kind of a welding method that use thehigh-frequency oscillation energy of ultrasonic to heat locally theasymmetric edge 52 and the chair 5 at the same time, has the followingdisadvantages: (1) In the welding process, the pernicious gases andsmoke generated in the operating environment increase as welding spotsincrease; (2) In the welding process, the level of the physical andchemical reactions polluting the environment increase as welding spotsincrease; (3) In order to increasing the beauty of the conventionalchair 5, the welding spots must be processed by the tools for grinding,milling, and polishing; (4) Even the cut asymmetric edge 52 of themetal-net frame 51 is welded and finished, as shown in FIG. 7(B), if theprocesses such as cutting, welding and grinding are not operatedproperly and thus the asymmetric edge 52 remain have sharp parts thatmay cause the user being slashed or other harmful factors.

Thus it can be seen that the above-described conventional articles stillhave many drawbacks, are not well designed, and need to be improvedurgently.

In view of above-described disadvantages derived from the conventionalchair with metal structure, the present inventor had devoted to improveand innovate, and, after studying intensively for many years, developedsuccessfully a structure of an improved chair according to the presentinvention.

SUMMARY OF THE INVENTION

The objective of the present invention is to provide a structure of animproved chair, which provides a U-type fixing slit between the extendedpart of the edge-bar and the principal part which can facilitate fastfitting the metal-plate and welding the metal-plate on the chair-seatfirmly with 3-5 welding spots along each side.

The another objective of the present invention is to provide a structureof an improved chair which can reduce the usage of the welding materialand can reduce the time and cost of welding.

The still another objective of the present invention is to provide anoperating environment which the environmental pollution can be reduced,the environmental cleanness can be increased, and the temperature can belower.

The still another of the present invention is to provide a structure ofan improved chair which the working hour for grinding, milling, andpolishing and the grinding media can be reduced.

The still another objective of the present invention is to enhance thebeauty of the chair and to provide a safe chair that can hide theasymmetric edge after the metal-net frame is cut, wherein by welding theextended part, fit-rim and the principal part together via the holes ofthe edge-bar, and welding with several welding spots to join theextended part, fit-rim and the principal part together, and then fastpolishing the welding material on the holes.

The structure of an improved chair can achieve the above-mentionedobjectives of the present invention, comprising:

A chair, the chair composed of tube or prism as the principal holder hasfront-legs, rear-legs, arm-rests and an extended-bar. There is a fixspot on each front-leg. The fix spot is used to fix the set of theedge-bar of the chair-seat or the extended-bar.

A set of edge-bars of chair-back is composed of one upper edge-bar, onelower edge-bar and two side edge-bars by fixing both ends of the upperand lower edge-bars on the rear-legs of the chair.

A set of edge-bars of the chair-seat is composed of one front edge-bar,one rear edge-bar and two side edge-bars by fixing the two sideedge-bars on the fix spot of the front-leg or by placing two sideedge-bars on the extended-bar of the front-legs and fixing the sideedge-bars on the front-leg and fixing both ends of the rear edge-bar onthe rear-leg.

Two metal-plates is die-cast, there are several fit-rims on themetal-plate, the fit-rim matches the frame formed by the edge-barssurround the four sides of the metal-plate and bends inward and is usedfor fitting into the U-shape fixing slit of each edge-bar.

The edge-bar having a principal part and an extended part is die-cast,there is a U-shape fixing slit between the extended part and theprincipal part, and the extended part has several holes. After thefit-rim of the metal-plate fitted into the U-shape fixing slit, theedge-bars and the metal-plate can be welded or riveted at the severalholes of the extended part into a unified connector, which is unable tobe dismantled.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings disclose an illustrative embodiment of the presentinvention which serves to exemplify the various advantages and objectshereof, and are as follows:

FIG. 1 is the stereo schematic diagram of a structure of an improvedchair according to the present invention;

FIG. 2 is the stereo schematic diagram of the chair;

FIG. 3 is the stereo schematic diagram of the metal-plate;

FIG. 4 is the enlarged stereo schematic diagram of the A perspectiveview;

FIG. 5(A)˜(F) is the sectional view of the edge-bar of the structure ofan improved chair according to the present invention;

FIG. 6(A) is the sectional view of the first embodiment of the presentinvention wherein the bended inward fit-rim of the metal-plate is fittedinto the U-shape fixing slit;

FIG. 6(B) is the sectional view of the second embodiment of the presentinvention wherein the bended inward fit-rim of the metal-plate is fittedinto the U-shape fixing slit;

FIG. 7(A) and FIG. 8(A) is the stereo schematic diagram of theconventional metal-net frame seat;

FIG. 8(B) is the enlarged stereo schematic diagram of the B perspectiveview; and

FIG. 8(B) is the enlarged stereo schematic diagram of the C perspectiveview.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, FIG. 2, FIG. 3, FIG. 5(A)-FIG. 5(F), the structureof an improved chair according to the present invention providesprimarily comprising:

A chair 1, the chair 1 composed of tube or prism as the principal holderhas front-legs 11, rear-legs 12, arm-rests 13 and an extended-bar 14.There is a fix spot 111 on each front-leg 11. The fix spot 111 is usedto fix the set of the edge-bar 2 of the chair-seat or the extended-bar14.

A set of edge-bars 2 of chair-back is composed of one upper edge-bar 2,one lower edge-bar 2 and two side edge-bars 2 by fixing both ends of theupper and lower edge-bars 2 on the rear-legs 12 of the chair.

A set of edge-bars 2 of the chair-seat is composed of one front edge-bar2, one rear edge-bar 2 and two side edge-bars 2 by fixing the two sideedge-bars 2 on the fix spot 111 of the front-leg or by placing two sideedge-bars 2 on the extended-bar 14 of the front-legs 11 and fixing theside edge-bars 2 on the front-leg 11 and fixing both ends of the rearedge-bar 2 on the rear-leg 12.

Two metal-plates 3 is die-cast, there are several fit-rims 31 on themetal-plate 3, the fit-rim 31 matches the frame formed by the edge-bars2 surround the four sides of the metal-plate 3 and bends inward and isused for fitting into the U-shape fixing slit 23 of each edge-bar 2.

The edge-bar having a principal part and an extended part is die-cast,there is a U-shape fixing slit between the extended part and theprincipal part, and the extended part has several holes. After thefit-rim of the metal-plate fitted into the U-shape fixing slit, theedge-bars and the metal-plate can be welded or riveted at the severalholes of the extended part into a unified connector, which is unable tobe dismantled.

The following will describe the present invention with more details,please refer to FIG. 5(A)-FIG. 5(F) and FIG. 6(A) again. In thestructure of an improved chair 1, the side-bar 2 is extruded die-castand has a principal part 21 and an extended part 22, and there is aU-shape fixing slit 23 between the extended part 22 and the principalpart 21, and the bended inward fit-rim 31 of the metal-plate 3 can bejust fitted into the U-shape fixing slit 23 of the side-bar 2, and theframe formed by the edge-bars 2 just surround the four sides of themetal-plate 3, and at the holes 24 opened along the extended part 22 ofthe edge-bar 2 (as shown in FIG. 6(A)), using welding and riveting tojoin the extended part 22 of the edge-bar 2, the fit-rim of themetal-plate 3, and the principal part 21 of the edge-bar 2 into anconnector which is unable to be dismantled.

After the metal-plate surrounded by the edge-bars 2 use welding orriveting to join the extended part 22 of the edge-bar 2, the fit-rim 31of the metal-plate 3, and the principal part 21 of the edge-bar 2,subsequently the fixed set of edge-bars of the chair-back and the fixedset of edge-bars of the chair-seat is fixed on the front-leg 11, therear-leg 12 and arm-rest 13; the set of edge-bars of the chair-back isassembled by fixing the ends of the upper edge-bar 2 and the loweredge-bar 2 on the rear-leg 12; the set of edge-bars of the chair-seat isassembled by fixing the two side edge-bars on the fix spot 111 of thefront-leg 11 or by placing two side edge-bars 2 on the extended-bar 14of the front-legs 11 and fixing both ends of the rear edge-bars on therear-leg 12 and fixing both ends of the arm-rest 13 on the front-leg 11and the rear-leg 12. Since, after the metal-plate 3 surrounded byedge-bars use welding or riveting to join the extended part 22 of theedge-bar 2, the fit-rim 31 of the metal-plate 3, and the principal part21 of the edge-bar 2, the welding material on the holes 24 of theextended part 22 can be polished, and thus the beauty of the chair 1 canbe enhanced due to there is no welded spot or welded mark. More, a safestructure of an improved chair can be formed while the chair 1 ispainted with powder to hide the asymmetric edge 52 of the cut metal-netframe in the edge-bar 2.

Compared with the above-mentioned cited reference and other conventionaltechnology, the structure of an improved chair according to the presentinvention has the following advantages:

1. According to the structure of the improved chair provided by thepresent invention, those edge-bars can be fast welded on the chair-seatsection and chair-back section according to the shape of the seatsection and the back section during processing.

2. Fitting the bended inward fit-rim of the metal-plate into the U-shapefixing slit of each edge-bar can reduce the misgivings that the userscould be hurt by the asymmetric edge of the metal-plate caused by theincomplete cutting and the inappropriate welding or milling.

3. After the bended inward fit-rim of the metal-plate is fitted into theU-shape fixing slit of each edge-bar, the chair-seat section and thechair-back section of the chair can not only possess the capability forsupporting weight but also further enhance the safety and the beauty ofthe chair.

4. The present invention also is a structure of a safe chair, whereinthe extended part, fit-rim and the principal part is welded together viathe holes of the edge-bars, and the extended part, the fit-rim and theprincipal part is joined together by several welding spots, and thewelding material on holes can be polished fast, and thus the beauty ofthe chain can be enhanced and the asymmetric edge of the metal-net framecut during processing can be hidden.

Many changes and modifications in the above described embodiment of theinvention can, of course, be carried out without departing from thescope thereof. Accordingly, to promote the progress in science and theuseful arts, the invention is disclosed and is intended to be limitedonly by the scope of the appended claims. Representative symbols of maincomponents 1 chair 11 front-leg 111 fix spot 12 rear-leg 13 arm-rest 14extended-bar 2 edge-bar 21 principal part 22 extended part 23 U-shapefixing slit 24 hole 3 metal-plate 31 fit-rim 5 conventional chair withmetal-net frame 51 metal-net frame 52 asymmetric edge

1. A structure of an improved chair, comprising: a chair composed oftube or prism as the principal holder and having front-legs, rear-legs,arm-rests and an extended-bar, wherein a fix spot installed on eachfront-leg is used to fix a set of an edge-bar of a chair-seat or saidextended-bar; a set of edge-bars of chair-back composed of one upperedge-bar, one lower edge-bar and two side edge-bars by fixing both endsof the upper and lower edge-bars on the rear-legs of the chair; a set ofedge-bars of the chair-seat composed of one front edge-bar, one rearedge-bar and two side edge-bars by fixing the two side edge-bars on thefix spot of the front-leg or by placing two side edge-bars on theextended-bar of the front-legs and fixing the side edge-bars on thefront-leg and fixing both ends of the rear edge-bar on the rear-leg; twometal-plates being die-cast, wherein a plurality of fit-rim installs onsaid metal-plate, and said fit-rim matching the frame formed by saidedge-bars surround the four sides of said metal-plate and bendinginwardly is used for fitting into the U-shape fixing slit of eachedge-bar; wherein said edge-bar having a principal part and an extendedpart is die-cast, and an U-shape fixing slit installs between saidextended part and said principal part, and said extended part hasseveral holes; after said fit-rim of said metal-plate fits into theU-shape fixing slit, said edge-bars and said metal-plate are welded orriveted with said several holes of said extended part into an unifiedconnector, which is unable to be dismantled.